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2019ncov, background, bacterium, biohazard, care, concept, coronavirus, coughing, covid19, danger, design, disease, earth, epidemic, fever, flu, global, globe, health, illness, infect, infected, infection, infectious, influenza, mask, medical, medicine, outbreak, pandemic, planet, pneumonia, pollution, prevention, protect, protection, quarantine, respiratory, safety, science, sickness, symbol, treatment, vaccine, virus, warning, who, world,